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Microwave Filter on PCB

Application ID: 4461

Microstrip filters can be fabricated directly on a printed circuit board (PCB) with a microstrip line going from the input to the output. Along the microstrip line there are a number of stubs of certain lengths and widths. The design of the filter involves choosing the impedance of the microstrip line, the impedance of the stub microstrips, and the length of the stubs.

This particular filter has a seventh-pole low-pass Chebyshev response, and the entire layout with dielectric layer is imported from an ODB++(X) file using the ECAD Import feature.

The model uses the Electromagnetic waves application mode that solves the vector Helmholtz wave equation. The example analyzes the transfer function (S-parameters) of a low-pass filter on a printed circuit
board.

The characteristics of the filter are sensitive to the placement and length of the stubs; therefore this model also analyzes the change in filter characteristics as a function of mechanical deformation.

The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.